A: It's because Henry Heinz considered 57 a lucky number. Heinz was already producing more than 60 products when it began using the "57 varieties" slogan.

Q: The Porsche 911 is one of the world's most iconic cars, but why "911"?

REUTERS/Michaela Rehle

A: The car was originally going to be called the Porsche 901, but Peugeot forced a name change. Peugeot claimed it had naming rights to a three-digit model number with a 0 in the middle of it. Porsche simply replaced the 0 with a 1.

Q: Why's it called 7UP?

A: Britvic, which distributes 7UP in the UK and Ireland, claims the brand was named after the seven main ingredients in the drink. The drink was originally created in 1929 after CL Grigg won a competition in the US to find the tastiest lemon-lime drink. But his original name for it — Bib-label Lithiated Lemon Lime Soda — was a little hard to pronounce.

Q: Why is it called the "Six Flags" amusement park?

A: The corporation is named "Six Flags Over Texas," which references the six nations that have had sovereignty over the state: France, Mexico, Spain, the Republic of Texas, the Confederate States of America, and the US.

Six Flags

Q: You've probably flown on one, but do you know why it's called a Boeing 747?

A: After World War II ended, the military airplane manufacturer divided its engineering departments into different numbered divisions: 300s and 400s for aircraft, 500s for turbine engines, 600s for rockets and missiles, and 700s for jet-aircraft transportation.

Q: Where does the Jack Daniel's "Old No. 7" come from?

Amanda Macias/Business Insider

A: Only Jack knows! A fire destroyed any records that would have proved one theory that the No. 7 was applied to the Jack Daniel's distillery for government registration, or if it was his lucky number, or he had seven girlfriends, or if it was the No. 7 train that carried his whiskey.

Q: Everyone knows Levi's, but do you know the importance of Levi's 501 number?

A: The Levi's company was officially incorporated in 1890, and it was also the year its XX (an industry term meaning high-quality) copper-riveted pants were given the patent lot number "501." Levi Strauss and Co. admits itself that it doesn't know why this number was chosen. The company also made a 201 jean — a less expensive version of the pants — as well as other products using other three-digit numbers.

A: OK, this was an easy one. When 7-Eleven opened its first store in 1946, the name referenced its opening times. Now, the majority of 7-Eleven stores are open 24 hours a day.

Q: Why did Cadbury's call it a "99" Flake?

FlickrCC/nikoretro

A: One theory suggests that in a bid to appeal to the Italian expatriates at the center of the UK ice-cream industry, Cadbury named its flake after the Italian monarchy's elite guard of 99 soldiers. But BBC Two program "Balderdash and Piffle" found that the myth actually referred to the Vatican's Swiss Guard, which traditionally had 105 members.

Q: You may use 3M's products like Scotch Tape and Post-Its, but do you know why it's called 3M?

A: 3M was originally called the Minnesota Mining and Manufacturing Company. It started out harvesting corundum at Crystal Bay mine, but pivoted the business when it was discovered corundum supplies in the mine were limited.